The Stability of Intelligence From Age 11 to Age 90 Years

As a foundation for studies of human cognitive aging, it is important to know the stability of individual differences in cognitive ability across the life course. Few studies of cognitive ability have tested the same individuals in youth and old age. We examined the stability and concurrent and predictive validity of individual differences in the same intelligence test administered to the same individuals (the Lothian Birth Cohort of 1921, N = 106) at ages 11 and 90 years. The correlation of Moray House Test scores between age 11 and age 90 was .54 (.67 when corrected for range restriction). This is a valuable foundation for estimating the extent to which cognitive-ability differences in very old age are accounted for by the lifelong stable trait and by the causes of cognitive change across the life course. Moray House Test scores showed strong concurrent and predictive validity with “gold standard” cognitive tests at ages 11 and 90.

[1]  J. Brandt,et al.  Intelligence and education as predictors of cognitive state in late life , 1995, Neurology.

[2]  Marie Wiberg,et al.  A comparison of two approaches to correction of restriction of range in correlation analysis , 2009 .

[3]  Robert A. Bornstein,et al.  The Wechsler Memory Scale—Revised , 1990 .

[4]  N. Brody A lifetime of intelligence: Follow-up studies of the Scottish Mental Surveys of 1932 and 1947, Ian J. Deary, Lawrence J. Whalley, John M. Starr. American Psychological Association, Wahington, DC, USA (2009), ISBN: 13: 978-I-4338-0400-7, ISBN-1-4338-0400-X, xvi+285pp , 2009 .

[5]  R. Mccall,et al.  Childhood IQ's as Predictors of Adult Educational and Occupational Status. , 1978, Science.

[6]  W. Johnson Correlation and explaining variance: To square or not to square? , 2011 .

[7]  PhilipR. Wenham,et al.  Apolipoprotein E genotyping by one-stage PCR , 1991, The Lancet.

[8]  E. Tucker-Drob,et al.  Neurocognitive functions and everyday functions change together in old age. , 2011, Neuropsychology.

[9]  I. Deary,et al.  Are Apparent Sex Differences in Mean IQ Scores Created in Part by Sample Restriction and Increased Male Variance , 2009 .

[10]  W. Owens Is age kinder to the initially more able? , 1959, Journal of gerontology.

[11]  Ian J. Deary,et al.  The Stability of Individual Differences in Mental Ability from Childhood to Old Age: Follow-up of the 1932 Scottish Mental Survey , 2000 .

[12]  James R. Burke,et al.  Systematic Review: Factors Associated With Risk for and Possible Prevention of Cognitive Decline in Later Life , 2010, Annals of Internal Medicine.

[13]  S. Folstein,et al.  "Mini-mental state". A practical method for grading the cognitive state of patients for the clinician. , 1975, Journal of psychiatric research.

[14]  T. Arbuckle,et al.  Stability of intelligence: a 40-year follow-up. , 1987, Canadian journal of psychology.

[15]  W. Sanderson,et al.  The coming acceleration of global population ageing , 2008, Nature.

[16]  J. Raven,et al.  Manual for Raven's progressive matrices and vocabulary scales , 1962 .

[17]  G. Huston The Hospital Anxiety and Depression Scale. , 1987, The Journal of rheumatology.

[18]  R. R. Rusk The intelligence of Scottish children. , 1940 .

[19]  Ian J. Deary,et al.  Edinburgh Research Explorer Intelligence and personality as predictors of illness and death: How researchers in differential psychology and chronic disease epidemiology are collaborating to understand and address health inequalities , 2013 .

[20]  Ian J Deary,et al.  Longitudinal cohort study of childhood IQ and survival up to age 76 , 2001, BMJ : British Medical Journal.

[21]  Y. Nishiwaki,et al.  Early life factors , childhood cognition and postal questionnaire response rate in middle age : the Aberdeen Children of the 1950 s study , 2019 .

[22]  D. Lubinski Cognitive epidemiology: With emphasis on untangling cognitive ability and socioeconomic status , 2009 .

[23]  Ian J Deary,et al.  Cohort profile: the Lothian Birth Cohorts of 1921 and 1936. , 2012, International journal of epidemiology.

[24]  W. Owens Age and mental abilities: a second adult follow-up. , 1966, Journal of educational psychology.

[25]  Roger T Staff,et al.  Reserve, brain changes, and decline. , 2012, Neuroimaging clinics of North America.

[26]  Great Britain. Foreign Office. Census 1951 : classification of occupations , 1956 .

[27]  Ian J Deary,et al.  The impact of childhood intelligence on later life: following up the Scottish mental surveys of 1932 and 1947. , 2004, Journal of personality and social psychology.

[28]  Ian J. Deary,et al.  Reaction times and intelligence differences: A population-based cohort study , 2001 .

[29]  L. Gottfredson,et al.  Intelligence: is it the epidemiologists' elusive "fundamental cause" of social class inequalities in health? , 2004, Journal of personality and social psychology.

[30]  Ian J Deary,et al.  Stability and change in intelligence from age 11 to ages 70, 79, and 87: the Lothian Birth Cohorts of 1921 and 1936. , 2011, Psychology and aging.

[31]  Ian J. Deary,et al.  Childhood cognitive ability and risk of late-onset Alzheimer and vascular dementia , 2008, Neurology.

[32]  A. Jensen,et al.  The g factor , 1996, Nature.

[33]  M. Marmot,et al.  Does cognitive reserve shape cognitive decline? , 2011, Annals of neurology.

[34]  Marie Wiberg,et al.  Implications of range restriction : a comparison of two approaches for correcting correlation in range restriction. , 2009 .

[35]  S. Dunn Book Review: The Level and Trend of National Intelligence , 1963 .

[36]  George M. Martin The biology of aging: 1985–2010 and beyond , 2011, FASEB journal : official publication of the Federation of American Societies for Experimental Biology.

[37]  Sally Brown,et al.  Education in Transition: What Role for Research? SCRE Publication No. 102. A Collection of Papers To Mark the 10th Anniversary of the Founding of the Scottish Council for Research in Education. , 1988 .

[38]  I. Deary,et al.  Is age kinder to the initially more able?: Yes, and no , 2010, Intelligence.

[39]  Michael C. Pyryt Human cognitive abilities: A survey of factor analytic studies , 1998 .